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#1 |
Registered User
Join Date: Feb 2009
Location: San Luis Obispo, CA
Posts: 32
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rear axle question
I have a 65 c20 and i am having a hard time trying to find out which rearend i have. I haven't had any luck with tags, i know it's a 10 bolt though.
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#2 |
Registerd User
Join Date: Sep 2008
Location: Oklahoma
Posts: 2,118
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Re: rear axle question
I don't know when they started it but 10 lug is a 1-ton pattern.
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#3 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: rear axle question
It does not have 10 lug nuts, but 10 bolts holding the rear cover on right?
Take a look at the front where the driveshaft goes into it. Does it look like the center section comes out of it like a ford 9 inch? If it does the you have an HO52 rear end. It is a corporate design made by Eaton. The housing should be a welded steel housing not a cast center section with the metal tubes plug welded into the center casting. It is a strong rear end for normal usage almost as strong as a 14 bolt full floater. They usually have a 4.10 or 4.56 axle ratio and some came with a No-Spin (Detroit Locker). |
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#4 |
Registerd User
Join Date: Sep 2008
Location: Oklahoma
Posts: 2,118
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Re: rear axle question
Guess i need to learn to read to. Oh well.
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#5 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: rear axle question
If your truck has coil springs, it would be the Eaton HO52. If you have leafs then it should be a Dana 60. The rear cover on the Eaton HO52 is perfectly round whereas the Dana is irregular shaped. Both have 10 bolts on the cover.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#6 |
Registered User
Join Date: Feb 2009
Location: San Luis Obispo, CA
Posts: 32
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Re: rear axle question
It does have 10 bolts holding on the rear pan and it is welded together as stated. I have heard that it was an eaton rearend (old one). I would of included a pic but was experiencing camera problems. More or less though the pic would of showed at the 3 and 9 o'clock positions 2 bolts close together and the other six spaced out evenly between the top and botom.
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#7 |
Registered User
Join Date: Feb 2009
Location: San Luis Obispo, CA
Posts: 32
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Re: rear axle question
Ya, it appears to be a perfectly round rear cover. I currently am running a 283, with an aluminum 2 speed powerglide. I have 16 inch rims with if i remember right 225/70. All i know is the truck runs fine doing 55, 60 sounds like it's screaming and anything higher sounds like it's going to blow. From what i am hearing this rearend is quite possibly 4.56. Sound about right?
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#8 |
Registered User
Join Date: Oct 2003
Location: Battleground, Washington
Posts: 177
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Re: rear axle question
4:11 or 4:56 were the options.
__________________
'77 GMC SWB '66 SNB (Project) Battle Ground, WA |
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#9 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: rear axle question
Sounds like you need a 700R4 overdrive automatic.
If you have 4.10's overdrive will put you at 2.90 highway gear in OD If you have 4.56's overdrive will put you at 3.20 highway gear in OD This should put you at about 2200 at 65 to 70 with 4.10's and 2400 with 4.56 gears. These are rough mathematical estimates I am doing in my head but you can do the math on a calculator. OD in a 700R4 is .70 in final drive. So reduce your gear ratio by 30% to calculate final drive ratio. BTW a disc brake conversion is easy on the Eation/HO52. you can use the same bracket and parts as you would a 14 bolt. Brake parts for the HO52 can be hard to find. Front discs are pretty much a bolt on as well, from a a later model 2wd 3/4 ton. Tie rod ends may be different but 90% is a bolt on. |
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#10 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: rear axle question
Looks like Texas and I were thinking the same thing at about the same time!
Nice upgrades to these trucks are the discs, preferably all 4, an OD automatic and an HEI distributor. Thats all you need to bring these trucks up to dealing with todays traffic and improving reliability. |
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#11 | |
Registered User
Join Date: Jun 2008
Location: North SD County
Posts: 631
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Re: rear axle question
Quote:
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..............................._________ ......___________//___[[___{\ _____ ...../__(_(O)_)___/____/____/_(O)_/ 1964 C20 Long Stepside 3 Door Crew Cab - Armbruster-Stageway Conversion Y2K INDN Chief "ONE OF A KIND, NOT ONE OF THE CROWD" Aug 2010 - Front end frame cleanup & engine swap done!!! June 2011 - Rear end bagged Sept 2011 - Rebuild motor top end Sept 2012 - Parked and slowly working on it. Aug 2013 - Front end bagged - finally! Aug 2014 - Stepside swap conversion done. Finally ready to start bodywork! Have a few KEWL ideas... Here is my build thread: http://www.67-72chevytrucks.com/vboa...d.php?t=335427 |
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#12 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: rear axle question
Hey Norm, I saw you today on Main Street! Were your wipers working?
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#13 | |
Registered User
Join Date: Sep 2006
Location: League City, Texas
Posts: 732
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Re: rear axle question
Quote:
I am running almost the same set up. I have 235/85/16's tires. There are numbers on the gears or you can just count the teeth and divide. I have a 4.56 in mine. I plan on a TH700R4 conversion in the future. The noise from the fixed radiator fan doesn't help much in the noise department. |
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#14 | |
Registered User
Join Date: Feb 2009
Location: San Luis Obispo, CA
Posts: 32
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Re: rear axle question
Quote:
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#15 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: rear axle question
Powerglides are kind of a whiney tranny IMO. Could also be the rear end. The HO52 on my '66 C20 had some gear noise.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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